inrush current

[Adrculda]

My setup has changed slightly, but will still need a soft start.
I have TWO ANTEK AN10440 ( 40VAC @ 25A ) with 4 power boards
On each main rail boards are setup on a CCRC principle.
AC -Rectifiers - 2x Main Cap - 4x Resistor - 1x Main cap - 1x De-coupling cap- DC OUT
Each board has both rails on it.

Rectifiers are MBR40250 ( 250V 40A Schottky's )
Main caps are 15000uF 63V Chemi-Con KMH
De-coupling caps are 0.1uF 400V Vishay Film caps
Resistors are 4W 5% Dale Wire Wound / Non-inductive.

Guestimating Output ~56VDC @ 50A on BOTH rails

Pics Below...

An externally hosted image should be here but it was not working when we last tested it.

 

[djk]

MBR40250 Ifsm=150A

http://www.onsemi.com/pub_link/Collateral/MBR40250-D.PDF

An ordinary 6A rectifier has an Ifsm=400A rating, so fast rectifiers need inrush limiting more so than ordinary rectifiers.

http://www.onsemi.com/pub_link/Collateral/MR750-D.PDF

 

[Adrculda]

Thanks for the heads up...
Hence more of a reason why to use a something along the line of a PWM limiter until 30% of rail operating voltage is achieved.

Now wondering....
What the 110V 50A output to the speakers would sound like

 

[Adrculda]

110V 50A output to the speakers would sound like

Just realized Antek test torroids with secondaries in parallel...
So it's 12.5A per secondary coil or 25A for both coils.

Quick math...

40VAC x 1.4 = 56VDC to each rail at 12.5A per toroid

Rail to Rail I should see 112VDC @ 12.5A on each.

 

[Ametherm]

Send me a message if you are still having difficulty